|Bomb them with Butter|
The only butter phrase I found was under War in "The New International Dictionary of Quotations" by Margaret Miner and Hugh Rawson: |
"Guns will make us powerful. Butter will only make us fat." Hermann Goering, radio speech, 1936.
"Bomb them with butter, bribe them with hope." Peace slogan from http://www.nonviolence.org/slogansforpeace.htm No origin found so far.